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          jdk11的jni编程
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        <h1 id="jdk11的jni编程"><a href="#jdk11的jni编程" class="headerlink" title="jdk11的jni编程"></a>jdk11的jni编程</h1><p>首先写一个测试Class   </p>
<pre><code>public class JNIDemo &#123;
    //定义一个方法，该方法在C中实现
    public native void testHello();
    public static void main(String[] args)&#123;
        //加载C文件
        System.loadLibrary(&quot;JNIDemo&quot;);//C的动态链接库的名字
        System.out.println(&quot;加载成功&quot;);
        JNIDemo jniDemo = new JNIDemo();//本测试类
        jniDemo.testHello();
    &#125;
&#125;    </code></pre>
<p>接下来就是生成头文件了</p>
<p>执行命令<br>**</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">javac -h jni JNIDemo.java</span><br></pre></td></tr></table></figure>
<p>jni是文件存放目录，JNIDemo.java是测试类<br>**</p>
<p>头文件里面的内容</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* DO NOT EDIT THIS FILE - it is machine generated */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;jni.h&gt;</span></span></span><br><span class="line"><span class="comment">/* Header for class JNIDemo */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifndef</span> _Included_JNIDemo</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> _Included_JNIDemo</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> __cplusplus</span></span><br><span class="line"><span class="keyword">extern</span> <span class="string">&quot;C&quot;</span> &#123;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"> * Class:     JNIDemo</span></span><br><span class="line"><span class="comment"> * Method:    testHello</span></span><br><span class="line"><span class="comment"> * Signature: ()V</span></span><br><span class="line"><span class="comment">   */</span></span><br><span class="line">   JNIEXPORT <span class="keyword">void</span> JNICALL Java_JNIDemo_testHello</span><br><span class="line">   (JNIEnv *, jobject);</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> __cplusplus</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br></pre></td></tr></table></figure>
<p>那么我们就实现这个C的函数</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;JNIDemo.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string.h&gt;</span></span></span><br><span class="line"></span><br><span class="line">JNIEXPORT <span class="keyword">void</span> JNICALL Java_JNIDemo_testHello</span><br><span class="line">  (JNIEnv *env, jobject obj)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;Hello Jni\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&quot;JNIDemo.h&quot;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;string.h&gt;</span></span></span><br><span class="line"></span><br><span class="line">JNIEXPORT <span class="keyword">void</span> JNICALL Java_JNIDemo_testHello</span><br><span class="line">  (JNIEnv *env, jobject obj)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;Hello Jni\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>接着编译并生成O文件</p>
<p>**<br>/usr/lib/jvm/java-11-oracle/include  这个是JDK路径<br>./jni/JNIDemo.c 这个是我们刚刚写的C文件路径</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">gcc -c -fPIC -I /usr/lib/jvm/java-11-oracle/include -I /usr/lib/jvm/java-11-oracle/include/linux ./jni/JNIDemo.c -o JNIDemo.o</span><br></pre></td></tr></table></figure>
<p>JDK路径可以用${JAVA_HOME}代替</p>
<p>**</p>
<p>我们还要生成SO文件<br>**</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">gcc -shared JNIDemo.o -o libJNIDemo.so</span><br></pre></td></tr></table></figure>
<p>**</p>
<p>通知动态链接程序此共享文件的路径<br>export LD_LIBRARY_PATH=pwd:$LD_LIBRARY_PATH</p>
<p>也可以把so文件复制到/usr/lib目录下</p>
<p>接着就可以正常编译java，并运行了。</p>

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